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At the age of 30.Hersey suddenly became a celebrity.

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If yon want my advice，you should revise（B级）your plan for the trip to Beijing．

A. change
B. exchange
C. enlarge
D. encourage

A pill 0f multivitamins may contain all of the following substances EXCEPT_____。

A. all vitamins in the B group
B. vitamins C and E
C. much iron and folate
D. antiviral substances

He inspected the ear before he bought it．

A. invested
B. managed
C. maintained
D. examined

The following developing countries are doing very well scientific researeh on nanotechnology EXCEPT

A. China
Brazil
C. Iran
D. India